The purpose of this stage of the analysis was to determine whether the two methods predicted pavement performance in a consistent manner across a range of design conditions typical of Ontario. First, the nationally-calibrated MEPDG pavement distress models were used to predict the performance of the pavements designed using the AASHTO 1993 method. Historical flexible, rigid, and asphalt overlay pavement designs completed using the AASHTO 1993 pavement design method for the MTO were evaluated using a two-stage procedure. The purpose of this research was to conduct a comparative analysis of Ontario structural pavement designs using the AASHTO 1993 Guide for Design of Pavement Structures and the Mechanistic-Empirical Pavement Design Guide. Although the MEPDG provides a rational pavement design procedure with a solid foundation in engineering mechanics, a considerable amount of work is required to adapt and validate the MEPDG to Ontario conditions. The Mechanistic-Empirical Pavement Design Guide (MEPDG) was developed to address the perceived limitations of the AASHTO 1993 Guide. Despite its widespread use, the AASHTO 1993 pavement design method has significant limitations stemming primarily from the limited range of conditions observed at the AASHTO Road Test from which its empirical relationships were derived. That some additional research will be cost-Įffective for each and every user agency in or-ĭesign related project level pavement management – Economic evaluation of alternative pavement design strategies – Reliability / – Pavement design procedures for new construction or reconstruction : Design requirements – Highway pavement structural design – Low-volume road design / – Pavement design procedures for rehabilitation of existing pavements : Rehabilitation concepts – Guides for field data collection – Rehabilitation methods other than overlay – Rehabilitation methods with overlays / – Mechanistic-empirical design procedures.The AASHTO 1993 Guide for Design of Pavement Structures is the most widely used pavement design method in both Canada and the United States, and is currently used by the Ministry of Transportation of Ontario (MTO) for both flexible and rigid pavement design. Large expansion of this Guide, it is anticipated The complexity of pavement design and the State has no data of methodology to develop the Values with adequate accuracy, no additionalįinally, for those sensitive inputs for which the Sufficient data or methods to estimate design
Those that are significant and the state has Propriate, no additional effort is required. Inputs have a significant effect on pavementĭesign answers for its range of conditions.įor inputs that are insignificant or inap. TO mostĮffectively use the Guide it is suggested that the userĬonduct a sensitivity study to determine which Each user should consider this to be a referenceĭocument and carefully evaluate his Or her need ofĮach concept and what initial values to use. Shown that have limited support in research or experi-Įnce. Without lengthy research, values and concepts are Marizes the mechanistic/empirical status. In-service performance, and are incorporated in Significant improvements in pavement design willĬxcur as these mechanistic models are calibrated to Of itfirmation exists to design pavements utilizing The nsk Force recognizes that a considerable body The new Guide hasįurther expanded with the &’llowing 14 major new Models to expand the framework so designers couldĬonsider Other conditions. Original Interim Guide contained many additional Grade, non-mixed traffic, one environment, etc., the Was decided that this Guide uould retain the basicĪlgorithms developed from the AASHO Road Test as Generally accepted procedures could be identified, it Portions of the Interim Guide because no other
The Interim Guide incorporating new developmentsĪnd specifically addressing pavement rehabilitation.īecause many states were found to be using at least Tee of AASHTO-was assigned the task of rewriting Sutrommittees, and one from the Planning CMIWit Lhsk Force On Pavements-composed of membersįrom the Subcommittee on Design, one eachįmrn the Materials, Construction, and Maintenance Pavement Structures published in 1972 and revised inīecause this is such an important topic, the Joint Research effort was the Interim Guide for the Design Of Highway and transportation departments the Fed-Įral Government have sponsored a continuous pro. In an effort to reduce this cost, the state Ment Of our nation’s highway system is the pavement Tion costs are considered, the single most costly When construction, maintenance, and rehabilita.